An inflatable restraint deployment system

Abstract: A supplemental inflatable restraint assembly 20 includes a canister 24 and a gas generator 22 to inflate an air bag 30 for deployment into the passenger compartment of a motor vehicle. Access to the assembly 20 is closed by a door 10 in an interior trim product 16, which door is held down by a cable release mechanism 36 that will separate from the door 10 as the door 10 is opened during supplemental inflatable restraint deployment.

Description: This invention relates to inflatable restraint systems for use in motor vehicles and more particularly to supplemental inflatable restraint systems which are housed behind an interior trim product of the vehicle beyond an opening which is closed by a door that opens when a gas bag is inflated. Inflatable restraint systems for vehicles require a cover which opens to provide a path for deployment of a gas bag into the passenger compartment as it is inflated. Some of the prior art pads or covers for air bag devices are not soft and do not match or conform to the styling and aesthetic requirements of an associated interior trim product in which the supplemental inflatable restraint system is housed. Such covers are often formed from injection molded thermoplastic elastomers or thermoplastic olefins. While such materials are suitable for mid-mount locations such as on the front vertical surface of an instrument panel, they do not perform well if subjected to radiant heating, e.g., sunlight directed through a front windshield of a vehicle. Other prior art pads or covers include a foamed interior which provides a soft feel and an outer skin of cast plastisol, e.g., polyvinyl chloride (PVC) or urethane skin, ABS/PVC/nitrile tripolymer vacuum formable sheet, dry cast polymer skins, or injection molded PVC, which can be aesthetically matched to the material of the outer surface of an interior product which houses the supplemental inflatable restraint system. Examples of such prior art pads or covers are shown in United States Patent No. 3,708,179 which discloses mid-mounted doors formed of a layer of urethane foam and an outer cover of a plastisol skin material. The '179 structure is supported on a pair of spaced hinge pins for movement outwardly of the front vertical face of an instrument panel so as to permit deployment of an air bag into the passenger compartment at the passenger side of the front seat. United States Patent Nos. 4,946,653 and 4,893,833 disclose door configurations for closing an upper mount configured supplemental inflatable restraint system wherein the door is located in an upper surface of an instrument panel and moved upwardly toward the windshield of the vehicle when the air bag is deployed. One problem with such prior art systems has been how to hold down the rear edge (from the in car position) of the door adjacent the rear edge of the deployment opening in the interior trim product. In the case of top doors, the rear edge is located at a point where children can pry the door open unless it is firmly fastened in place by interlocking mechanical members. One problem with such interlocking structure is that it may not allow for a prompt and repeatable release of the door when an air bag is inflated to impact against the underside of the door. In such cases, the access door may not fully open and thereby may hinder unobstructed deployment of the air bag into the passenger compartment of a vehicle. One solution to such problems is set forth in United States Patent No. 5,161,819 that provides two hook and loop fastener strips one strip located on each of first and second substrates to define a specified hold down force. The hold down force is maintained over periods of use and variations in temperature extremes so as to assure release of the door to provide unobstructed deployment of the air bag into a passenger compartment when vehicle impact causes a gas generator to inflate the air bag. Each of the fastener strips is connected to one of the substrates to form a tamper proof connection for holding the door in place in the deployment opening prior to supplemental inflatable restraint deployment. The fastener strips are arranged to either release in tension or shear to allow for unrestrained movement of the door into an upwardly pivoted position between a windshield and the passenger compartment of a vehicle when a vehicle impact causes the air bag to be inflated for deployment into the passenger compartment. While suitable for their intended purpose such tamper proof hold down arrangements have a hold down force that is dependent upon the area of connection between the hook and loop components. Additionally, the hold down force will be dependent upon the alignment of the respective components one to the other. In some arrangements such considerations present problems of selection and assembly. Another hold down mechanism for a door closure in a supplemental inflatable restraint deployment system is set forth in United States Patent No. 5,066,037 wherein a flange on the door closure is fit within a U-shaped clamp. In such arrangements the locking flange and clamp must be separately positioned and aligned during the assembly of the supplemental inflatable restraint deployment system. A further hold down mechanism is known from US-A-5 211 421. According to the present invention, there is provided an inflatable restraint deployment system, comprising a hold-down mechanism for fastening a door of the deployment system in a tamper-proof closed position, said hold-down mechanism comprising a first member on said door and a second member for mounting on a fixed support of an interior trim product, said hold-down mechanism including an elongate tie which extends from the first member to the second member and is connected at one end to the first member and at the opposite end to the second member, the tension being settable to set the hold-down force on the door, wherein during deployment of said inflatable restraint, said first member pulls free from said elongate tie and said elongate tie is not fractured and wherein said elongate tie is responsive to deployment of said inflatable restraint to fall and remain within the confines of said interior trim product following opening of the door in response to deployment of the gas bag. Owing to the present invention, it is possible to provide an improved supplemental inflatable restraint deployment system with an easily assembled hold-down mechanism for fastening a door in a tamper-proof closed position and wherein all or most of the hold-down mechanism is located within the confines of an interior trim product following opening of the door in response to deployment of an air bag. It is preferred that there should be a mounting hole in the first member, and that the elongate tie should have an anchor connected at ore end thereof adapted releasably to connect into the mounting hole. Also owing to the present invention it is possible to provide such a door and hold-down mechanism wherein a cable is connected between first and second mountings respectively formed on the interior trim product and the door at a point closely adjacent the rear end of the door wherein the rear end is referenced with respect to the interior passenger compartment of a motor vehicle. Further owing to the invention it is possible to provide a hold-down mechanism for a door covering a supplemental inflatable restraint system that is easily manufactured and assembled and that will enable standard substrate configurations to be used in foam molding manufacture while providing a hold-down connection at the rear end of a door and the rear end of an access opening closed by the door that will release through a wide range of temperatures and following protracted periods of use and that will separate substantially fully from the door and remain within the interior trim product following supplemental inflatable restraint deployment. The hold-down connection is configured to maintain the door tamper-proof. Further owing to the present invention it is possible to provide a door for closing an opening in an interior trim component of a vehicle in which an inflatable restraint assembly is housed for deployment of an air bag into the passenger compartment upon vehicle impart. The interior trim component has an outer covering of cast vinyl material (or urethane or vacuum-formed stock) around the opening with styling grains and colors for providing an aesthetic appearance and including a backing of soft foam material. The door has an outer cover of cast vinyl material (or the aforesaid equivalents thereof) with styling grains and colors corresponding to the outer covering of the interior trim component; the door has a shape corresponding to the opening in the interior trim component and is fit with respect to the opening for closing the opening and for preventing access to the air bag assembly; the door has a first substrate, the interior trim product has a second substrate, both substrates are located closely adjacent the rear edge of the opening and the rear edge of the door and a cable release mechanism is operative to hold the door in place over a wide range of temperature conditions and for extended periods of use; the cable release mechanism is operative at a specified force level when an air bag is inflated against the underside of the door so as to separate the door from the interior trim product when the air bag is inflated and deployed through the opening into the passenger compartment of a vehicle. Still further owing to the present invention it is possible to provide a door for closing an opening in an interior trim component of a vehicle in which an inflatable air bag assembly is housed for deployment of an inflated air bag into the passenger compartment upon vehicle impact. The interior trim component has an outer covering of cast vinyl material (or urethane or vacuum-formed stock) around the opening with styling grains and colors for providing an aesthetic appearance. The door has an outer cover of cast vinyl material (or the aforesaid equivalents thereof) with styling grains and colors corresponding to the outer covering of the interior trim component; the door has a shape corresponding to the opening in the interior trim component and is fit with respect to the opening for closing the opening and for preventing access to the air bag assembly; the door has an insert with a configured hole therein located closely adjacent the rear edge of the opening and the rear edge of the door and a release mechanism includes a cable having one end thereof that is interlocked in the configured hole so as to be operative to hold the door in place with respect to the opening with the same hold down effectiveness over a wide range of temperature conditions and for extended periods of use; the cable further including an opposite end that fits through an anchor opening for locking the door closure in place and wherein the cable release mechanism is operative at a specified force level when an air bag is inflated against the underside of the door so as to slide the one end with respect to the configured hole to a position that will cause the cable to separate from the insert in the door and remain within the interior trim product when the air bag is inflated and deployed through the opening into the passenger compartment of a vehicle. In a preferred embodiment, such hold-down mechanism includes a smooth edge insert on the door having a geometrically configured slot therein located in a plane substantially parallel to an inner surface portion of the door, and a cable having a first end portion thereon configured to interlock within the configured slot and a second end portion that is connected to a self-locking nut for pulling the cable in a direction to cause the first end portion to engage the insert so as to pull the door into a closed, tamper-proof relationship with respect to an interior trim product. Further owing to the present invention it is possible to provide such a hold-down mechanism in association with a door for an opening through which an inflatable restraint device such as an air bag is deployed following vehicle impact, the door further comprising an outer plastisol (or dry cast vinyl thermoplastic molded particles; urethane; or vacuum formed ABS/PVC) skin and a foam interior so that it will conform to the styling, feel and aesthetic appearance of an associated interior trim product which covers the inflatable restraint device. Also owing to the present invention it is possible to provide a door for closing an opening in an interior trim component of a vehicle in which a supplemental inflatable restraint is housed for deployment of an inflated air bag into the passenger compartment upon vehicle impact; the interior trim component having an outer covering around the opening having styling for providing an aesthetic appearance; the door having an outer cover with styling corresponding to the cuter covering of the interior trim component; the door having a shape corresponding to the opening in the interior trim component and being fit with respect to the opening for closing the opening and the door having a substrate: and wherein the hold-down mechanism is attached between the door and the interior trim component; the hold-down mechanism including a cable mounting hole in association with the closure panel and hold-down mechanism further including a cable having one end thereof adapted to releasably connect into the cable mounting hole and the cable being connected at the opposite end thereof to the interior trim product. Further owing to the present invention it is possible to provide a door for closing an opening having a rear end, and sides formed in an interior trim component of a vehicle in which an inflatable air bag assembly is housed for deployment of an inflated air bag into the passenger compartment upon vehicle impact; the interior trim component having an outer covering providing an aesthetic appearance; the door having an outer cover with an appearance corresponding to the outer covering of the interior trim component; the door having a shape corresponding to the opening in the interior trim component and being fit with respect to the opening for closing the opening and access to the inflatable air bag assembly wherein the door has a first substrate including a cable mounting hole therein; a second substrate located adjacent the rear end of the opening and a cable connected thereto; and the cable engageable with the cable mounting hole for securing the door within the access opening to prevent tampering and unauthorized access to the air bag assembly and the cable being releasable from the door upon deployment of an air bag thereagainst. In a preferred embodiment of the present invention, the system includes a door for closing an opening having a rear edge, a front edge located adjacent a windshield and side edges, in an interior trim component of a vehicle in which an inflatable air bag assembly is housed for deployment of an inflated air bag into the passenger compartment upon vehicle impact; the interior trim component having an outer covering around the opening having styling for providing an aesthetic appearance; the door having a shape corresponding to the opening in the interior trim component and being fit with respect to the opening for closing the opening and for preventing access to the inflatable air bag assembly; and first and second substrates connected respectively to the door and the interior trim component; means forming a cable mounting hole in the first substrate and a cable connected to the second substrate and attachment surfaces between the cable mounting hole and the cable closely adjacent the rear edge of the opening; the attachment surfaces are operative in response to supplemental inflatable restraint deployment to cause the cable to slide out of interconnected relationship with the cable mounting hole for separating the door from the interior trim product at the rear edge of the opening when the air bag is inflated for causing the door to open for unobstructed deployment of an air bag through the opening into the passenger compartment of a vehicle between the windshield and an occupant of the vehicle. Still owing to the present invention it is possible to provide a supplemental inflatable restraint system having a door with an inner surface and front and rear edges, an interior trim product having a door opening therein having a rear edge and a front edge; a hinge connecting the front edge of the door to the interior trim product at the front edge of the door opening for pivotal movement upwardly with respect to the door opening; and a hold-down system for holding the door against the interior trim product to prevent tampering with the supplemental inflatable restraint system, including a cable hold-down mechanism having a flexible cable; a bracket supported on the interior trim product; a member having a cable mounting hole formed therein secured to the door on the inner surface thereof adjacent the rear edge thereof; and opposite ends of the cable connected respectively to the cable mounting hole and to the bracket for holding the door in engagement with the interior trim product at the door opening therein; one end of the cable being releasable from the cable mounting hole to separate the cable from the door upon air bag deployment. The cable may have a conically shaped member on one end thereof; the cable mounting hole have a large diameter segment and an elongate segment with a width less than the diameter of the large diameter segment; the conically shaped member be insertable through the large diameter segment and movable relative thereto into interlocked relationship with the elongate segment and the conically shaped member be responsive to release of an air bag against the inner surface of the door to deform the elongate segment of the cable mounting hole so as to move out of interlocked relationship with the elongate segment, allowing the door to be disengaged from the cable and pivoted upwardly with respect to the interior trim product. Still further owing to the present invention it is possible to provide a supplemental inflatable restraint system having a lock member on a door; a geometrically configured slot formed in the door and a cable having a first end portion thereon configured to interlock within the configured slot and a second end portion that is connected to the interior trim product for pulling the cable in a direction to cause the first end portion to engage the lock member so as to pull the door into a closed, tamper-proof relationship with respect to the interior trim product and the first end portion being slidably releasable from the lock member when an air bag is deployed. The second end portion may have a threaded portion; and a locking nut be engageable with the threaded portion for pulling the cable in a direction to cause the first end portion to engage the lock member so as to pull the door into a closed, tamper-proof relationship with respect to the interior trim product. Alternatively, the cable may comprise a plastic member having a conical head on one end thereof and having a plurality of axially spaced annular segments on the opposite end thereof selectively engageable with the interior trim product for providing an adjustable hold-down force on the door to ensure that it is seated in a closed tamper-proof relationship with respect to the door opening in the interior trim product. If desired, the lock member may be an L-shaped bracket and the cable hold-down hole be formed in one leg of the L-shaped bracket and the elongate segment of the hold-down hole be directed laterally of the interior trim product. In order that the invention may be clearly understood and readily carried into effect, reference will now be made, by way of example, to the accompanying drawings, wherein: Figure 1 is a perspective view of an instrument panel or dashboard which is one suitable interior trim product for housing and providing an opening for deployment of an inflatable restraint into the passenger compartment of a motor vehicle; Figure 2 is an enlarged sectional view of one embodiment of the invention taken along the line 2-2 of Figure 1; Figure 3 is a fragmentary elevational view in the direction of the arrow 3 in Figure 2 of an insert with a cable mounting hole; Figure 4 is an elevational view looking in the direction of the arrow 4 in Figure 2; FIG. 5 is a fragmentary perspective view of an embodiment of the supplemental inflatable restraint with the door and instrument panel separated to show seating surfaces thereon; FIG. 6 is an enlarged sectional view of the embodiment of FIG. 5 showing the door closed; FIG. 7 is a fragmentary elevational view of the rear of the door looking in the direction of the arrow 7 in FIG. 6; FIG. 8 is a fragmentary elevational view of an instrument panel substrate at the front edge thereof looking in the direction of the arrow 8 in FIG. 6; and FIG. 9 is an enlarged elevational view of a cable used in the embodiment of FIGS. 5-8. Referring now to FIG. 1, a door closure member 10 or closure panel 10 for closing an opening to a supplemental inflatable restraint system is shown. In this embodiment of the invention, the door 10 is shown in a top mount position in which it is located to cover an opening 12 formed through the top surface 14 of a dashboard or instrument panel 16. The opening 12 has a rear edge 12a located adjacent the rear 16a of the instrument panel 16. Opening 12 has a front edge 12b located in underlying relationship to a sloped front windshield 18. For purposes of this description, the reference to a forward or rearward location is made with respect to the position of the component within the passenger compartment of a motor vehicle. While shown in the upper surface of the instrument panel 16, the opening 12 could also be formed in the rear surface 16a in a mid-mount position. The top mount or mid-mount of the door 10 depends upon the location of the underlying supplemental inflatable restraint system 20. In the illustrated embodiment of FIG. 2, the supplemental inflatable restraint system 20 includes a gas generator 22 located in a canister or casing 24 mounted on a suitable vehicle component not shown. The gas generator 22 has a plurality of openings 22a through which a suitable inflatant gas flows when an impact sensor 26 is actuated upon vehicle impact to condition a controller 28 to initiate gas generation all as is well known to those skilled in the art. while a pyrotechnic type inflatant generator is shown, the invention is equally suitable for use with inflatants such as pressurized gases held within a pressure vessel. The inflatant gas is directed into the interior of an inflatable air bag 30 connected at one end 30a to the casing 24 and having convolutions 30b which expand as the air bag is inflated to impact against the underside of the door 10 to cause it to pivot upwardly toward the windshield 18 to allow for deployment of the air bag 30 through the opening 12 into a position to protect a passenger. While the present embodiment is shown in a passenger side location, the hold down mechanism of the present invention is equally suitable for use in arrangements in which the supplemental inflatable restraint is located within a steering column and covered by a door that will open when the air bag is deployed to protect the driver of a motor vehicle. In accordance with the present embodiment, the door 10 is shown as including a lip portion 32 that overlaps the surface of the instrument panel 16 not only at the rear surface 16a thereof but also at side surfaces 16b and 16c thereof. In this embodiment of the invention, the door 10 is connected to the instrument panel 16 by a hinge 34 that can be integrally connected bendable metal inserts between the instrument panel 16 at the front edge 12b of the opening 12 and the door 10 at the front edge 10a thereof. A hold down mechanism 36 is provided that includes a cable mounting hole 38 (FIG. 3) formed in a door substrate or insert member 40. The insert member 40 is covered by a layer of decorative material 42 (FIG. 2) wrapped at its edge 42a around the edge of the insert member. In the embodiment of Figure 1, that includes a color and texture that can correspond to the aesthetic appearance of the surrounding surface of the interior trim product. The cable mounting hole 38 has a geometric shape that is semi-circular at a large diameter end portion 38a that is intersected by an elongated slot portion 38b having a width less than the diameter of the end portion 38a. Additionally, the elongated slot portion 38b has a length that is slightly greater than the diameter of the end 38a. A hold down cable 44 is connected between the insert member 40 and an inwardly directed portion 46 of a substrate 48 of the instrument panel 16. More particularly, the hold down cable 44 has one end thereof connected to a member 50 having a conical surface 50a thereon that is dimensioned at one end to have a diameter substantially equal to that of the hold down cable 44 and less than the width of the elongated slot portion 38b. The other end of the conical surface 50a has a diameter that is greater than the width of the elongated slot 38b but less than the diameter of the large diameter end portion 38a such that when the member 50 is connected to the cable mounting hole 38 it first is slipped through the end portion 38a and then directed into the elongated slot portion 38b. The opposite end of the hold down cable 44 is connected to a threaded member 52 that is directed through a hole 54 in the portion 46. The threaded member 52 is threadably connected to a self locking nut 56. The self locking nut 56 is tightened on the threaded member 52 to establish a length L between the portion 46 and the cable mounting hole 38 that will cause the rear edge and sides of the door 10 to be firmly held against the surfaces 16a, 16b and 16c to prevent the door 10 from being opened by tampering or the like. A feature of the present embodiment is that the cable mounting hole 38 is mounted in a segment 40a of the insert member 40 that is offset with respect to a surface 40b of the insert member 40 against which the air bag is deployed during a vehicle collision or other event that will cause deployment of the air bag 30 from the canister 24. In accordance with the present embodiment,the offset angle between segment 40a and surface 40b is selected such that the conical surface 50a of the member 50 and the surface 40a define attachment surfaces that will react to produce a resultant force on the member 50 that causes the member 50 to deform the elongated slot portion 38b at which point the door member 10 is released to swing upwardly about the hinge 34 such that the opening 12 will. be cleared for deployment of the air bag 30 therethrough. A feature of the present embodiment is that once the door 10 is released, the cable drops into the interior of the interior trim product as shown in broken line outline in Figure 2 at 44'. In the illustrated embodiment of Figures 1-4, a single cable hold down mechanism is located at the midpoint of the rear edge of the door 10. Additional cable hold down mechanisms can be provided to meet the force requirements and the configuration of the opening in the interior trim product and the configuration of the door. In any case, the resultant product results in an arrangement following supplemental inflatable restrain deployment in which hold down components on both the door and the interior trim product remain at locations hidden within the door and the interior trim product. The door can have a vinyl outer cover that can be formed from cast vinyl material by processes such as those set forth in United States Patent Nos. 4,664,864 and 4,784,911, both commonly assigned to the same assignee as in the present application. Reference can be made to said Patents for further details. Such outer covers have colors and grain appearances that are accurately matched to the appearance of the surface of an associated interior trim product such as the illustrated instrument panel. The vinyl outer cover can have edge portions thereon formed over the peripheral edge of a first construction substrate of the type which is mounted on a lid of a foam mold apparatus such as illustrated and described in United States Patent No. 4,806,094, commonly assigned to the same assignee as the present invention. Reference can be made to said Patent for further details. In accordance with the present embodiment, the substrate can have construction holes which aid in its connection to standard mold apparatus lids and which will enable it to be located so as to form a sealed connection with respect to the outer cover and to define a space into which foam precursors are directed in a known manner for reaction to form a soft feel foam layer behind the cover such that a finished appearance will be formed at edge surfaces of the door and the outer cover will be supported by the foam layer to match the styling and appearance of a foamed, interior trim product. The edge surfaces conform to the shape of the opening 12 so that the door 10 will closely fit with respect to the opening 12 where it seats on suitable recessed support surfaces in the instrument panel 16. The retention force defined by the cable hold down mechanism 36 remains the same over a wide range of operating conditions. Accordingly, a specified force required to release the door assembly 10 can be maintained by a predetermined number of the individual cable hold down mechanisms. The number of mechanisms can be selected for a particular interior trim product, canister and air bag design to assure that the door assembly will be tamper proof and yet open at the specified force when the air bag is inflated thereby to assure quick and unobstructed deployment of the air bag into the passenger compartment. In the embodiments of FIG. 1 and FIG. 5, the release is by a pull-out force which in certain applications would be in the order of between 0-100 lbs. (ie up to approx. 45 kg) per cable to provide a desired tamper proof hold down force for typical instrument panel applications of the type shown in FIG. 1 while providing desired door separation when the air bag 30 is inflated. The cable hold down mechanism is first connected to the door and then a tool (not shown) is used to thread the self-locking nut 56 in place until the lip portion 32 is firmly secured in a tamper proof relationship with the instrument panel surfaces 16a, 16b, 16c. In the embodiment of the invention shown in FIGS. 5 - 7, an instrument panel 60 is illustrated having a deployment opening 62 therein that covers a supplemental restraint system like that shown in the embodiment of FIGS. 1-4. In this embodiment of the invention the deployment opening 62 is closed by a door 64 having an outer decorative skin layer 66, a foam layer 68 and an inner substrate 70 all of the type described with respect to the embodiment of FIGS. 1-4. In this embodiment the rear edge 72 of the door 64 is held against a ledge 74 formed on a forwardly directed segment 76 of the instrument panel 60. The instrument panel 60, like that in the embodiment of FIGS. 1-4, includes an outer decorative layer 78, a foam layer 80 and an inner substrate member 82 for supporting the instrument panel 60 on the vehicle frame. The door 64 is connected at a hinge member 84 thereon to the front edge 86 of the opening 62 for supporting the door 64 for upwardly directed pivotal movement in the direction of the windshield when the air bag is deployed. A front segment 88 of the door 64 overlaps a front surface of the instrument panel at 60a. In accordance with the embodiment, the door 64 is held in a tamper proof closed position by a cable hold down mechanism 90 that includes a pair of cable assemblies 92, 94 (FIG. 5) on either side of the rear edge 72 of the door 64. A lock plate 98 is connected to the substrate 70 of the door 64 across its rear edge 72. The lock plate 98 is L-shaped, as shown in FIG. 6, and includes outwardly directed flanges 100, 102 connected to the substrate on either side of right angle bent segments 104, 106 that form the L-shape of the lock plate 98. The segment 106 has a pair of cable hold down openings 108, 110 that are connected to one end of the cable assemblies 92, 94, respectively, The substrate 82 of the instrument panel 60 has a hold down bracket 122 connected thereto with a distal end 124 that extends inwardly and in spaced parallelism with the lock plate segment 106. The distal end 124 has spaced openings 126 and 128 therein (FIG. 8) that are connected to the other end of each of the cable assemblies 92, 94, respectively. Each of the spaced openings 126, 128 has an open side segment 129 and a seat segment 131 that will engage the cable assemblies 92,94 when they are connected between the door 64 and the forwardly directed portion 76 of instrument panel 60 for applying a tamper proof hold down force therebetween, The cable hold down openings 108, 110 each include a large diameter segment 130 and an elongated side segment 132 that has a width less than the diameter of the segment 130 and a length that is greater than that of the diameter of the segment 130. The hold down openings 108, 110 are thereby adapted to interlock with a conically shaped anchor 134 formed on one end of a stem segment 136 of each of the cable assemblies 92, 94. The opposite end of the stem segment 136 has a plurality of axially spaced annular ribs 138 formed thereon that define a flexible fir tree configuration that will deflect radially inwardly toward the outer surface 136a of the stem segment 136 to enable the cable assemblies 92, 94 to be adjustably positioned within the hold down openings 126, 128 for varying the level of hold down force applied between the rear edge 72 of the door 64 and the ledge 74 thereby to provide a tamper proof connection therebetween. The stem segment 136 also includes a head portion 140 thereon having a diameter that will overlap the lower surface 142 of the brackets 122 to prevent the cable assemblies 92, 94 from separating from the flanges 122 as the door 64 is pivoted open in response to deployment of an air bag against the inner surface 70a of the inner substrate 70. In accordance with the present embodiment, during such supplemental inflatable restraint deployment, the force acting on the inner surface 70a will be directed to the lock plate segment 106 that has canted segments 116a, 116b that will cause the conically shaped anchor 134 on each of the cable assemblies 92, 94 to be deformed by the elongated segments 132 such that the anchor will be free to release from the door 64. The cables in both of the embodiments remain attached to an interior trim product. The cables, once detached, will remain within the interior of the interior trim product and the door will be deployed without the formation of rough tear edges thereon. The door assembly of the subject embodiments thereby provides a soft skin door that is easily matched to adjacent interior trim products having foamed in place material and wherein the door assembly can be formed by standard foam molding apparatus without requiring special modifications to substrate components or without requiring modification of the lid for carrying such substrates during the foam molding of the door. A second substrate on the interior trim product and the door substrate are associated with a fastener construction which will separate without formation of debris during door opening while providing a temperature and vibration insensitive hold down force so that the door is tamper proof while being easily and quickly released. While the system is shown in association with a door mounted in a dashboard or instrument panel, it is equally suitable for use with other interior trim products such as driver side steering wheel housings. The arrangement is manufactured not only with standard equipment practicing standard processing steps, it enables the door to be used in a more cost effective manner than the assemblies in the prior art. The invention has been described in an illustrative manner, and it is to be understood that the terminology which has been used is intended to be in the nature of words of description rather that of limitation. Obviously, many modifications and variations of the present invention in light of the above teachings may be made. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.

Claims: An inflatable restraint deployment system, comprising a hold-down mechanism (36;90) for fastening a door (10;64) of the deployment system in a tamper-proof closed position, said hold-down mechanism (36;90) comprising a first member (40;116) on said door (10;64) and a second member (46;122) for mounting on a fixed support (82) of an interior trim product (16), said hold-down mechanism (36;90) including an elongate tie (44,52;136) which extends from the first member (40;116) to the second member (46;122) and is connected at one end to the first member (40;116) and at the opposite end to the second member (46;122), the tension being settable to set the hold-down force on the door (10;64), wherein during deployment of said inflatable restraint (30), said first member (40;116) pulls free from said elongate tie (44,52;136) and said elongate tie (44,52;136) is not fractured and wherein said elongate tie (44,52;136) is responsive to deployment of said inflatable restraint (30) to fall and remain within the confines of said interior trim product (16) following opening of the door (10) in response to deployment of the gas bag (30). A system according to claim 1, wherein said elongate tie (44,52) is externally screwthreaded at said opposite end and a nut (56) is engageable with the screwthreading for tensioning the elongate tie (44,52). A system according to claim 1, wherein said elongate tie (136) has a plurality of axially spaced annular segments (138) therealong selectively engageable with said fixed support (82) for providing an adjustable hold-down force on said door (10;64). A system according to any preceding claim, wherein said first member (40;116) has a mounting hole (38;108) therein and said elongate tie (44,52;136) has an anchor (50,134) thereon to fit in said mounting hole (38;108) and to release from said hole (38;108) during deployment of said inflatable restraint (30). A system according to claim 4, wherein said anchor (50;134) is a head (50;134) which increases in diameter progressing axially outwardly of said elongate tie (44,52;136). A system according to claim 5, wherein said head (50;134) is frusto-conical. A system according to claim 4, 5, or 6, wherein said mounting hole (38;108) has a large diameter segment (38a;130), and an elongate segment (38b;132) of a width less than the diameter of said large diameter segment (38a;130), said anchor (50;134) is insertable through said large diameter segment (38a;130) and movable relative thereto into interlocked relationship with said elongate segment (38b;132), and said anchor (50;134) is responsive to release of said inflatable restraint (30) against the inner surface (40b;70a) of said door (10;64) to deform said first member (40;70,98) so as to move out of interlocked relationship with said elongate segment (38b;132) for allowing said door (10;64) to be disengaged from said elongate tie (44,52;136) and turned upwardly. A system according to claim 7, wherein said first member (70,98) comprises an L-shaped bracket (98) and said mounting hole (108) is formed in one leg (106) of said L-shaped bracket (98). A system according to claim 7 or 8, wherein said elongate segment (132) of said mounting hole (108) is directed laterally of the door (64).

Inventors: GUITARINI MARK S, GUITARINI, MARK S.
Applicants: DAVIDSON TEXTRON INC, DAVIDSON TEXTRON INC.
Application year: 1994
Main classification: B60R21
IPC codes: B60R21